convertformat: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/convertformat - from package: leptonica-progs

You may install the required package with command apt-get install {package}

Error in other languages:
convertformat: bevel nie gevind nie
convertformat: comandă negăsită
convertformat: comando não encontrado
convertformat: commande introuvable
convertformat: command not found
convertformat: käsku ei ole
convertformat: không tìm thấy lệnh
convertformat: komanda nerasta
convertformat: Kommando nicht gefunden.
convertformat: kommandot finns inte
convertformat: komut yok
convertformat: nie znaleziono polecenia
convertformat: níor aimsíodh an t-ordú
convertformat: no se encontró la orden
convertformat: no s'ha trobat l'ordre
convertformat: opdracht niet gevonden
convertformat: parancs nem található
convertformat: perintah tidak ditemukan
convertformat: príkaz nenájdený
convertformat: příkaz nenalezen
convertformat: команда не найдена
convertformat: командата не е открита
convertformat: 命令找不到
convertformat: コマンドが見つかりません